Key matrix of a telephone handset



FIG. 1 is a right perspective view of the new design;

FIG. 2 is a left perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right view thereof; and,

FIG. 5 is a front view thereof.

The portion of the handset shown in broken lines is for illustrativepurposes only and forms no part of the claimed design.

The ornamental design for a key matrix of a telephone handset, as shown.